MovieExchange has written up a nice little FAQ which you will find below, that should give you all some information and hopefully prevent the new folks from making threads and then feel bad because the veterans get on your case about making a thread.

Asking when the next sale will be is frowned upon. If you're a current customer of DDD, you will receive an email when the sale starts. If you're a subscriber of the DVD Talk newsletter, you will also get an email when the sale starts. Your best bet though is to watch the Bargains forum, because when it happens, you'll know. You will see a thread, and it grows, VERY quickly. You may also see or hear it advertised on local AM radio stations, and/or even national newspapers.

The sale usually happens twice a year and runs for a week and a half to two weeks. The last one was in June, the one before that was November of last year, but there's never any guarantee that it will take place. We don't get an official post until the day of or the day before the sale.

The 20% is taken off their current list price. Some newer items (for example, Sopranos season 5 during the last sale) are bumped up a few bucks beforehand, but the 20% off still makes for a great deal. You CANNOT use the coupon codes on pre-orders.

There are many different codes to use at checkout for the sale. There's a code for DVD Talk, as well as several others. When the sale kicks off, there will be a thread with people listing all the codes.

Each code can only be used once. You can use multiple codes, on multiple orders. The best bet is to build up a large order instead of ordering things as you think about them.

Another tip is to build your wish list in advance. Look what is on sale at the B&M's the week of the DDD sale, and DDD will usually match (on their webpage) the price, which you then will get an additional 20% off.

People are receiving post cards in the mail saying that the 20% sale starts tomorrow. The coupon code list on there is DD11. I'm sure just like every year, there will be the code dvdtalk as well as other codes to use.